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1 //-----------------------------------------------------------------------------
2 //
3 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
4 // at your option, any later version. See the LICENSE.txt file for the text of
5 // the license.
6 //-----------------------------------------------------------------------------
7 // Low frequency visa 200 tag commands
8 // by iceman
9 //-----------------------------------------------------------------------------
10
11 #include "cmdlfvisa2000.h"
12 #include "proxmark3.h"
13 #include "ui.h"
14 #include "util.h"
15 #include "graph.h"
16 #include "cmddata.h" // for ASKDemod_ext, g_debugMode, DemodBuffer ...
17 #include "cmdmain.h" // for clearCommandBuffer and WaitForResponseTimeout
18 #include "cmdlf.h"
19 #include "protocols.h" // for T55xx config register definitions
20 #include "lfdemod.h" // for Visa2kDemod_AM
21
22 #define BL0CK1 0x56495332
23
24 static int CmdHelp(const char *Cmd);
25
26 int usage_lf_visa2k_clone(void){
27 PrintAndLog("clone a Visa2000 tag to a T55x7 tag.");
28 PrintAndLog("Usage: lf visa2k clone [h] <card ID> <Q5>");
29 PrintAndLog("Options:");
30 PrintAndLog(" h : This help");
31 PrintAndLog(" <card ID> : Visa2k card ID");
32 PrintAndLog(" <Q5> : specify write to Q5 (t5555 instead of t55x7)");
33 PrintAndLog("");
34 PrintAndLog("Sample: lf visa2k clone 112233");
35 return 0;
36 }
37
38 int usage_lf_visa2k_sim(void) {
39 PrintAndLog("Enables simulation of visa2k card with specified card number.");
40 PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
41 PrintAndLog("");
42 PrintAndLog("Usage: lf visa2k sim [h] <card ID>");
43 PrintAndLog("Options:");
44 PrintAndLog(" h : This help");
45 PrintAndLog(" <card ID> : Visa2k card ID");
46 PrintAndLog("");
47 PrintAndLog("Sample: lf visa2k sim 112233");
48 return 0;
49 }
50
51 static uint8_t visa_chksum( uint32_t id ) {
52 uint8_t sum = 0;
53 for (uint8_t i = 0; i < 32; i += 4)
54 sum ^= (id >> i) & 0xF;
55
56 return sum;
57 }
58
59 static uint8_t visa_parity( uint32_t id) {
60 // 4bit parity LUT
61 uint8_t par_lut[] = {
62 0,1,1,0
63 ,1,0,0,1
64 ,1,0,0,1
65 ,0,1,1,0
66 };
67 uint8_t par = 0;
68 par |= par_lut[ (id >> 28) & 0xF ] << 7;
69 par |= par_lut[ (id >> 24) & 0xF ] << 6;
70 par |= par_lut[ (id >> 20) & 0xF ] << 5;
71 par |= par_lut[ (id >> 16) & 0xF ] << 4;
72 par |= par_lut[ (id >> 12) & 0xF ] << 3;
73 par |= par_lut[ (id >> 8) & 0xF ] << 2;
74 par |= par_lut[ (id >> 4) & 0xF ] << 1;
75 par |= par_lut[ (id & 0xF) ];
76 return par;
77 }
78
79
80 /**
81 *
82 * 56495332 00096ebd 00000077 —> tag id 618173
83 * aaaaaaaa iiiiiiii -----..c
84 *
85 * a = fixed value ascii 'VIS2'
86 * i = card id
87 * c = checksum (xor of card id)
88 * . = unknown
89 *
90 **/
91 //see ASKDemod for what args are accepted
92 int CmdVisa2kDemod(const char *Cmd) {
93
94 //sCmdAskEdgeDetect("");
95
96 //ASK / Manchester
97 bool st = true;
98 if (!ASKDemod_ext("64 0 0", false, false, 1, &st)) {
99 if (g_debugMode) PrintAndLog("DEBUG: Error - Visa2k: ASK/Manchester Demod failed");
100 return 0;
101 }
102 size_t size = DemodBufferLen;
103 int ans = Visa2kDemod_AM(DemodBuffer, &size);
104 if (ans < 0){
105 if (g_debugMode){
106 if (ans == -1)
107 PrintAndLog("DEBUG: Error - Visa2k: too few bits found");
108 else if (ans == -2)
109 PrintAndLog("DEBUG: Error - Visa2k: preamble not found");
110 else if (ans == -3)
111 PrintAndLog("DEBUG: Error - Visa2k: Size not correct: %d", size);
112 else
113 PrintAndLog("DEBUG: Error - Visa2k: ans: %d", ans);
114 }
115 return 0;
116 }
117 setDemodBuf(DemodBuffer, 96, ans);
118 //setGrid_Clock(64);
119
120 //got a good demod
121 uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
122 uint32_t raw2 = bytebits_to_byte(DemodBuffer+32, 32);
123 uint32_t raw3 = bytebits_to_byte(DemodBuffer+64, 32);
124
125 // chksum
126 uint8_t calc = visa_chksum(raw2);
127 uint8_t chk = raw3 & 0xF;
128
129 // test checksums
130 if ( chk != calc ) {
131 printf("DEBUG: error: Visa2000 checksum failed %x - %x\n", chk, calc);
132 return 0;
133 }
134 // parity
135 uint8_t calc_par = visa_parity(raw2);
136 uint8_t chk_par = (raw3 & 0xFF0) >> 4;
137 if ( calc_par != chk_par) {
138 printf("DEBUG: error: Visa2000 parity failed %x - %x\n", chk_par, calc_par);
139 return 0;
140 }
141 PrintAndLog("Visa2000 Tag Found: Card ID %u, Raw: %08X%08X%08X", raw2, raw1 ,raw2, raw3);
142 return 1;
143 }
144
145 int CmdVisa2kRead(const char *Cmd) {
146 CmdLFRead("s");
147 //64*96*2=12288 samples just in case we just missed the first preamble we can still catch 2 of them
148 getSamples("12500",true);
149 return CmdVisa2kDemod(Cmd);
150 }
151
152 int CmdVisa2kClone(const char *Cmd) {
153
154 uint64_t id = 0;
155 uint32_t blocks[4] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_64 | T55x7_ST_TERMINATOR | 3 << T55x7_MAXBLOCK_SHIFT, BL0CK1, 0};
156
157 char cmdp = param_getchar(Cmd, 0);
158 if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_clone();
159
160 id = param_get32ex(Cmd, 0, 0, 10);
161
162 //Q5
163 if (param_getchar(Cmd, 1) == 'Q' || param_getchar(Cmd, 1) == 'q') {
164 //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
165 blocks[0] = T5555_MODULATION_MANCHESTER | ((64-2)>>1) << T5555_BITRATE_SHIFT | T5555_ST_TERMINATOR | 3 << T5555_MAXBLOCK_SHIFT;
166 }
167
168 blocks[2] = id;
169 blocks[3] = (visa_parity(id) << 4) | visa_chksum(id);
170
171 PrintAndLog("Preparing to clone Visa2000 to T55x7 with CardId: %u", id);
172 PrintAndLog("Blk | Data ");
173 PrintAndLog("----+------------");
174 for(int i = 0; i<4; ++i)
175 PrintAndLog(" %02d | 0x%08x", i , blocks[i]);
176
177 UsbCommand resp;
178 UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
179
180 for (int i = 3; i >= 0; --i) {
181 c.arg[0] = blocks[i];
182 c.arg[1] = i;
183 clearCommandBuffer();
184 SendCommand(&c);
185 if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)){
186 PrintAndLog("Error occurred, device did not respond during write operation.");
187 return -1;
188 }
189 }
190 return 0;
191 }
192
193 int CmdVisa2kSim(const char *Cmd) {
194
195 uint32_t id = 0;
196 char cmdp = param_getchar(Cmd, 0);
197 if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_sim();
198
199 id = param_get32ex(Cmd, 0, 0, 10);
200
201 uint8_t clk = 64, encoding = 1, separator = 1, invert = 0;
202 uint16_t arg1, arg2;
203 size_t size = 96;
204 arg1 = clk << 8 | encoding;
205 arg2 = invert << 8 | separator;
206
207 PrintAndLog("Simulating Visa2000 - CardId: %u", id);
208
209 UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
210
211 uint32_t blocks[3] = { BL0CK1, id, (visa_parity(id) << 4) | visa_chksum(id) };
212
213 for(int i=0; i<3; ++i)
214 num_to_bytebits(blocks[i], 32, c.d.asBytes + i*32);
215
216 clearCommandBuffer();
217 SendCommand(&c);
218 return 0;
219 }
220
221 static command_t CommandTable[] = {
222 {"help", CmdHelp, 1, "This help"},
223 {"demod", CmdVisa2kDemod, 1, "Attempt to demod from GraphBuffer"},
224 {"read", CmdVisa2kRead, 0, "Attempt to read and extract tag data"},
225 {"clone", CmdVisa2kClone, 0, "clone Visa2000 tag"},
226 {"sim", CmdVisa2kSim, 0, "simulate Visa2000 tag"},
227 {NULL, NULL, 0, NULL}
228 };
229
230 int CmdLFVisa2k(const char *Cmd) {
231 clearCommandBuffer();
232 CmdsParse(CommandTable, Cmd);
233 return 0;
234 }
235
236 int CmdHelp(const char *Cmd) {
237 CmdsHelp(CommandTable);
238 return 0;
239 }
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